{"calculation_version":"2026-10-10.1","days":30,"nights":[{"best_hours":2.0,"best_label":"good","best_window":"03:15\u201305:15","dark_hours":7.74,"date":"2046-04-07","moon_free_dark_hours":7.72,"moon_illumination":2,"moon_separation":83.4,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.08,"best_label":"good","best_window":"03:10\u201305:15","dark_hours":7.68,"date":"2046-04-08","moon_free_dark_hours":7.02,"moon_illumination":6,"moon_separation":92.5,"score":null,"score_astronomy":52,"score_weather":null,"transit_alt":71.1,"transit_local":"08:15","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.08,"best_label":"good","best_window":"03:10\u201305:15","dark_hours":7.63,"date":"2046-04-09","moon_free_dark_hours":5.92,"moon_illumination":11,"moon_separation":101.7,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"08:10","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.08,"best_label":"good","best_window":"03:05\u201305:10","dark_hours":7.57,"date":"2046-04-10","moon_free_dark_hours":4.83,"moon_illumination":18,"moon_separation":110.7,"score":null,"score_astronomy":54,"score_weather":null,"transit_alt":71.1,"transit_local":"08:05","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"03:00\u201305:10","dark_hours":7.51,"date":"2046-04-11","moon_free_dark_hours":3.82,"moon_illumination":27,"moon_separation":119.4,"score":null,"score_astronomy":55,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.25,"best_label":"good","best_window":"02:55\u201305:10","dark_hours":7.46,"date":"2046-04-12","moon_free_dark_hours":2.93,"moon_illumination":37,"moon_separation":127.2,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"08:00","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.17,"best_label":"good","best_window":"02:55\u201305:05","dark_hours":7.4,"date":"2046-04-13","moon_free_dark_hours":2.17,"moon_illumination":48,"moon_separation":133.5,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"07:55","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.17,"best_label":"good","best_window":"02:55\u201305:05","dark_hours":7.34,"date":"2046-04-14","moon_free_dark_hours":1.53,"moon_illumination":59,"moon_separation":137.3,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"07:50","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.17,"best_label":"good","best_window":"02:50\u201305:00","dark_hours":7.28,"date":"2046-04-15","moon_free_dark_hours":0.98,"moon_illumination":70,"moon_separation":137.5,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"07:45","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.17,"best_label":"good","best_window":"02:50\u201305:00","dark_hours":7.23,"date":"2046-04-16","moon_free_dark_hours":0.48,"moon_illumination":80,"moon_separation":134.0,"score":null,"score_astronomy":56,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.25,"best_label":"good","best_window":"02:45\u201305:00","dark_hours":7.17,"date":"2046-04-17","moon_free_dark_hours":0.03,"moon_illumination":88,"moon_separation":127.3,"score":null,"score_astronomy":57,"score_weather":null,"transit_alt":71.1,"transit_local":"07:40","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.17,"best_label":"good","best_window":"02:45\u201304:55","dark_hours":7.11,"date":"2046-04-18","moon_free_dark_hours":0.0,"moon_illumination":95,"moon_separation":118.3,"score":null,"score_astronomy":51,"score_weather":null,"transit_alt":71.1,"transit_local":"07:35","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.17,"best_label":"good","best_window":"02:45\u201304:55","dark_hours":7.05,"date":"2046-04-19","moon_free_dark_hours":0.0,"moon_illumination":99,"moon_separation":108.1,"score":null,"score_astronomy":45,"score_weather":null,"transit_alt":71.1,"transit_local":"07:30","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.0,"best_label":"good","best_window":"02:50\u201304:50","dark_hours":6.99,"date":"2046-04-20","moon_free_dark_hours":0.0,"moon_illumination":100,"moon_separation":97.4,"score":null,"score_astronomy":40,"score_weather":null,"transit_alt":71.1,"transit_local":"07:25","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":1.67,"best_label":"good","best_window":"03:10\u201304:50","dark_hours":6.94,"date":"2046-04-21","moon_free_dark_hours":0.0,"moon_illumination":98,"moon_separation":86.5,"score":null,"score_astronomy":36,"score_weather":null,"transit_alt":71.1,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":1.25,"best_label":"good","best_window":"03:35\u201304:50","dark_hours":6.88,"date":"2046-04-22","moon_free_dark_hours":0.98,"moon_illumination":94,"moon_separation":76.1,"score":null,"score_astronomy":33,"score_weather":null,"transit_alt":71.1,"transit_local":"07:20","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":1.08,"best_label":"good","best_window":"03:40\u201304:45","dark_hours":6.82,"date":"2046-04-23","moon_free_dark_hours":2.08,"moon_illumination":87,"moon_separation":66.3,"score":null,"score_astronomy":31,"score_weather":null,"transit_alt":71.1,"transit_local":"07:15","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":1.25,"best_label":"good","best_window":"03:30\u201304:45","dark_hours":6.76,"date":"2046-04-24","moon_free_dark_hours":3.03,"moon_illumination":79,"moon_separation":57.6,"score":null,"score_astronomy":32,"score_weather":null,"transit_alt":71.1,"transit_local":"07:10","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.08,"best_label":"good","best_window":"02:35\u201304:40","dark_hours":6.7,"date":"2046-04-25","moon_free_dark_hours":3.8,"moon_illumination":70,"moon_separation":50.4,"score":null,"score_astronomy":34,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.67,"best_label":"good","best_window":"02:00\u201304:40","dark_hours":6.64,"date":"2046-04-26","moon_free_dark_hours":4.38,"moon_illumination":60,"moon_separation":45.1,"score":null,"score_astronomy":43,"score_weather":null,"transit_alt":71.1,"transit_local":"07:05","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.75,"best_label":"good","best_window":"01:55\u201304:40","dark_hours":6.59,"date":"2046-04-27","moon_free_dark_hours":4.87,"moon_illumination":50,"moon_separation":42.4,"score":null,"score_astronomy":53,"score_weather":null,"transit_alt":71.1,"transit_local":"07:00","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":2.67,"best_label":"good","best_window":"01:55\u201304:35","dark_hours":6.53,"date":"2046-04-28","moon_free_dark_hours":5.25,"moon_illumination":41,"moon_separation":42.4,"score":null,"score_astronomy":59,"score_weather":null,"transit_alt":71.1,"transit_local":"06:55","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":2.75,"best_label":"good","best_window":"01:50\u201304:35","dark_hours":6.47,"date":"2046-04-29","moon_free_dark_hours":5.58,"moon_illumination":32,"moon_separation":45.0,"score":null,"score_astronomy":64,"score_weather":null,"transit_alt":71.1,"transit_local":"06:50","verdict":"unknown","weather_source":"none","weekday":"Sun"},{"best_hours":2.83,"best_label":"good","best_window":"01:45\u201304:35","dark_hours":6.41,"date":"2046-04-30","moon_free_dark_hours":5.9,"moon_illumination":23,"moon_separation":49.8,"score":null,"score_astronomy":69,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Mon"},{"best_hours":2.83,"best_label":"good","best_window":"01:40\u201304:30","dark_hours":6.35,"date":"2046-05-01","moon_free_dark_hours":6.18,"moon_illumination":16,"moon_separation":56.2,"score":null,"score_astronomy":73,"score_weather":null,"transit_alt":71.1,"transit_local":"06:45","verdict":"unknown","weather_source":"none","weekday":"Tue"},{"best_hours":2.83,"best_label":"good","best_window":"01:40\u201304:30","dark_hours":6.3,"date":"2046-05-02","moon_free_dark_hours":6.28,"moon_illumination":10,"moon_separation":63.7,"score":null,"score_astronomy":76,"score_weather":null,"transit_alt":71.1,"transit_local":"06:40","verdict":"unknown","weather_source":"none","weekday":"Wed"},{"best_hours":2.83,"best_label":"good","best_window":"01:35\u201304:25","dark_hours":6.24,"date":"2046-05-03","moon_free_dark_hours":6.22,"moon_illumination":5,"moon_separation":72.0,"score":null,"score_astronomy":77,"score_weather":null,"transit_alt":71.1,"transit_local":"06:35","verdict":"unknown","weather_source":"none","weekday":"Thu"},{"best_hours":2.92,"best_label":"good","best_window":"01:30\u201304:25","dark_hours":6.18,"date":"2046-05-04","moon_free_dark_hours":6.17,"moon_illumination":2,"moon_separation":80.9,"score":null,"score_astronomy":78,"score_weather":null,"transit_alt":71.1,"transit_local":"06:30","verdict":"unknown","weather_source":"none","weekday":"Fri"},{"best_hours":3.0,"best_label":"good","best_window":"01:25\u201304:25","dark_hours":6.12,"date":"2046-05-05","moon_free_dark_hours":6.12,"moon_illumination":0,"moon_separation":90.0,"score":null,"score_astronomy":79,"score_weather":null,"transit_alt":71.1,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sat"},{"best_hours":3.0,"best_label":"good","best_window":"01:20\u201304:20","dark_hours":6.07,"date":"2046-05-06","moon_free_dark_hours":6.05,"moon_illumination":1,"moon_separation":99.4,"score":null,"score_astronomy":80,"score_weather":null,"transit_alt":71.1,"transit_local":"06:25","verdict":"unknown","weather_source":"none","weekday":"Sun"}],"note":"score_astronomy for every night; score_weather/score only where a forecast (next 4 days) or ERA5 history exists \u2014 null otherwise","start":"2046-04-07","target":{"dec":22.71085365,"name":"HD 189733","ra":300.18213726,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HD%20189733","source":"sesame","spectral_type":"K2V","type":"BY*","type_text":"BY Draconis variable \u2014 a spotted, rotating star","vmag":7.648}}